tìm x , biết a, 3/35 – (3/5 – x ) = 2/7 b, ( x + 1/2 ) . ( 2x + 1 ) = 0 c, ( 4/15 – 1/6 ) . x = 3/4 . 8 /27

Question

tìm x , biết a, 3/35 – (3/5 – x ) = 2/7
b, ( x + 1/2 ) . ( 2x + 1 ) = 0
c, ( 4/15 – 1/6 ) . x = 3/4 . 8 /27
tim-biet-a-3-35-3-5-2-7-b-1-2-2-1-0-c-4-15-1-6-3-4-8-27

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Maris 4 years 2020-11-24T03:31:04+00:00 1 Answers 104 views 0

Answers ( )

  1. Sigrid
    0
    2020-11-24T03:32:33+00:00
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    Bạn tham khảo!
    b) (x + 1/2) . (2x + 1) = 0
    ⇒ x + 1/2 = 0 or 2x + 1 = 0
    ⇒ x = 0 – 1/2 or 2x = 0 + 1
    ⇒ x = -1/2 or 2x = 1
    ⇒ x = -1/2 or x = 1 : 2
    ⇒ x = -1/2 or x = 1/2
    Vậy x = -1/2 or x = 1/2
    c) (4/15 – 1/6) . x= 3/4 . 8/27
    ⇒ 1/10 . x = 3/4 . 8/27
    ⇒ 1/10 . x = 2/9
    ⇒ x = 2/9 : 1/10
    ⇒ x = 2.9 . 10/1
    ⇒ x= 20/9
    Vậy x = 20/9
    @FbBinhne2k88

     

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